Mastering Two-Digit Addition with Regrouping

The video tutorial explains how to add two-digit numbers with regrouping. It begins by aligning the numbers to ensure the ones and tens are properly stacked. The process involves adding the ones first, regrouping if necessary, and then adding the tens. The example used is 45 + 36, which results in a sum of 81. The tutorial emphasizes the importance of carrying over when the sum of the ones exceeds ten.

What is the first step in adding two-digit numbers?

• Draw a line to separate the digits

• Align the numbers vertically

• Add the tens digits first

• Write down the final answer

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CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

Why is it important to align the numbers vertically?

• To make the addition easier

• All of the above

• To ensure the digits are added correctly

• To avoid mistakes in carrying over

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CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

What is the sum of the ones digits in the problem 45 + 36?

• 12

• 9

• 10

• 11

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CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

What do you do with the ten from the sum of the ones digits?

• Carry it over to the tens place

• Write it down in the ones place

• Ignore it

• Subtract it from the tens place

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CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

What is the sum of the tens digits after carrying over?

• 9

• 7

• 6

• 8

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CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

What should you do if the sum of the tens digits is more than 10?

• Carry over to the hundreds place

• Ignore the extra tens

• Write down the sum as it is

• Subtract 10 from the sum

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

What is the final sum of 45 + 36?

• 71

• 81

• 101

• 91

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CCSS.1.NBT.C.4

CCSS.2.NBT.B.5